function run() {
    var str = "中文javascript1024evm iot1024中文c/c++1024 from china ";
    console.log(str.replace("1024", " wuhan "))
    console.log(str.indexOf("evm"))

    str = "javascript中文evmiot中文c/cpp中文 from china "
    console.log(str.replace("中文", "zh-cn"))


    str = "D:\\a\\b\\c\\d"
    var res = str.split("\\")
    console.log(res)
    console.log(res.length)

    str = "**a **ab **abc **abcd **abcde"
    res = str.split("**")
    console.log(res)
    console.log(res.length)

    str = "//split1 //split2 //split3 //split4 //split5 //split6 //split7 //split8 //split9"
    res = str.split("//")
    console.log(res)
    console.log(res.length)

    str = "&&&分 &&&割 &&&分 &&&割 &&&/分"
    res = str.split("&&&")
    console.log(res)
    console.log(res.length)

    str = "武汉555 武汉666 武汉777 武汉888 武汉999"
    res = str.split("武汉")
    console.log(res)
    console.log(res.length)
}